The map below shows the percent of homes owner-occupied based on U.S. Census American Community Survey data for 2012-2016.

mid.hoods <- subset(hmt, hmt.tier %in% c("lower middle", "upper middle"))
bins <- c(seq(0, 1, 0.2))
pal <- colorBin("YlOrRd", domain = mid.hoods$Percent_Owner.2016, bins = bins)
leaflet() %>%
  setView(lng = -76.6, lat = 39.3, zoom = 11) %>%
  addProviderTiles(providers$Stamen.TonerLite) %>% 
  addPolygons(data = mid.hoods, 
              fillColor = ~pal(mid.hoods$Percent_Owner.2016), 
              color = iteam.colors[2], 
              weight = 1, 
              fillOpacity = .6,
              label = ~as.character(round(mid.hoods$Percent_Owner.2016, 2))) %>%
  addPolygons(data = hoods, 
              weight = 2, 
              color = "black",
              opacity = 0.5,
              fillOpacity = 0, 
              label = ~hoods$label) %>%
  addLegend(data = mid.hoods,
            position = "bottomright",
            pal = pal,
            values = ~mid.hoods$Percent_Owner.2016,
            title = "Percent Owner Occupied")
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